Guard for grab-bucket power-wheels.



E. B. PERRY.

GUARD FOR GRAB BUCKET POWER WHEELS! APPLICATION FILED MAY 3| i915.

Patented Dec. 4 1917.

Y E N DH 0 l T A naaseoa.

RRnEsr B. PERRY, or BAY CITY, MICHIGAN.

GUARD Ron. GRAB-BUCKET rownnwnnnm.

Specification of Letters Patent.

Patented Dec. 4t, 1911 Application filed May 3, 1915.' Serial No. 25,462.

To all whom it may concern."

Be it known that I, ERNEST B. P RRY, a citizen of the United States, residing at 'Bay City, in the county of Bay and State of ltlichigan, haveinvented certain new and useful Improvements in Guards for Grab- Bucket Power-Wheels; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates'to clam shell or grab buckets and pertains more particularly to that type ofgrab bucket comprising a pair of pivot-ally connected bowl-sect1ons adapted to close and open to seize and to discharge the load. I

In buckets of this type the bowls are usually pivoted to a shaft that extends across the bucket from side to side, the bowls being suspended by means of pivoted links connected at their upper ends to the upper center casting, to which the suspension cable is attached. On the bucket shaft a revoluble sheave is usually mounted, having laterally projecting hubs, and to each hub is secured one end of a chain, there being one chain at each side of the sheave, the upper end of the chain being secured to the upper center casting. A rope is secured to and passes around the rim of the sheave and when this rope is drawn upward the sheave is rotated and thereby winds the chains around the hubs of the sheave, raising the sheave and its shaft and closing the bucket.

My present improvement relates to the construction and mode of operation of a guard for the sheave of a bucket of the type just described, the purpose of the guard being to prevent the cable leaving the groove of the sheave, to prevent obstructions getting into the groove of the sheave underneath the cable and to provide a guard whereby the entire periphery of the sheave is covered and protected, except where the rope is passed through either in reeving the sheave, or in operating the bucket.

A further advantage of my improved guard is that even though the rope were to become very slack, and become looped outside the guard by sidewise tipping of the bucket when resting on a pile of material, and if the bucket were then brought up with a jerk the rope could not catch on the rim of the wheel and be drawn by the revolution of the wheel, underneath the guard to jam the rope between the wheel and the guard.

A still further object is to provide a guard of simple construction, that can be manufactured at relatively small expense, yet having great strength and durability.

With these and certain other objects in view, which will appear later in the specification, my improvement consists in the devices described and claimed and the equivalents thereof.

In the drawings, Figure 1 is a perspective view of my improved guarddetached from the sheave.

Fig. 2 is a side view of a bucket with the guard in place on the wheel.

As is clearly shown in the drawings, the bucket comprises the bowls 1 and 2 pivotally secured to the shaft 3 that extends across from side to side of the bucket. 1 is the sheave revolubly mounted on the shaft 3, and 5 and 6 are the chains, connected at their lower ends to the hubs of sheave 4 and at their upper ends to the upper center casting 7 8 and 9 are the links connecting the upper center casting to the bowels of the bucket.

The chain guard consists in a pair of hub plates 10 and 11, each preferably formed of a single piece of metal and having central openings 12 to allow shaft 3 to pass through, the plates being riveted to the blade-arms 13 of one of the bowls, as 2. The plates 11 have radially projecting arms 14 which are inclined from the plane of the plate toward the rim of the sheave, as shown in Fig. 1. Bars 15 pass around the rim of the guard, being secured at their ends to the arms 14: and to the rim 16 of the guard by means of bolts 17, or their equivalents. The bolts 17 pass through laterally projecting lugs 18 cast integral with the rim 16. The rim 16 is preferably of channel section consisting of the web 19 and the continuous annular flanges 20 and 21. The rim is preferably cast in two pieces which are secured together by means of bolts 22 passing through lugs 23 and 24 formed respectively on the two halves of the rim casting.

The web 19 is formed with two elongated openings 25 and 2 6 to permit the passage of the rope 27, by which thersheave 4 is rotated. i

It will be noted that the hub plates 10 When the bucket is open ready to drop its load upon the pile of material, a closed portiofiofi-the-guardis lowest,- as shown in Fig.

' l,-iand--whe'n the bucket is closed,- the opening 2-5 is;1ow'est.- Thus any material getting into" the guard will be dropped out when the bucket closes.

-Theopening 25 also affords an opportunity for the escape of loose material andopeningy26 is made use of in reevingthe bucket.

The 'space-between'the inner face of, web 19 andthe face of sheave .4 is sufficiently large to allow the p'assagebet-ween'them of Copies 'of tliis patent may be obtained for a fastening thimble 28, which is spliced into the rope to allow the rope to be attached to the shea've easily,

Haying thus" de'scribedm'y invention, what I claim and desire to secure by Letters Patent is- A guard for wheels of the class described comprisinga pairo'f'hub plates and a diametrically divided rim, each member of said rim comprising two continuous sid fl an'ges' e-Xtendingfroniend to end of said member, and a web integral with said flanges, each web formed with anelongated opening-.theree in, laterally projecting lugs integral with said rim, and radially disposed arms secured at their outer ends tosaid lugs and at their inner ends" to said hub plates.

In testimony whereof, I afiix my signature in presence of two witnesses:

ERNEST B; PERRY.

. Witnesses:

B=. DI V H. U; WILLARD;

five cents each, by addressing the c ominissioner oi Batenti. Washington, D; 0. 

